I've not heard of a wool hen before. It looks like cloth hanging up? Chicks raised by a hen spend most of the first week under her and her body heat is a bit higher than ours. I think it's low temps I'm sorry to say. 85 is not high enough and they don't produce enough body heat at such a young age to keep each other warm enough. Especially if one falls asleep on the cool side. They get loud, then lethargic, then pass. How do their peeps sound? Is it high pitched and insistant? Or soft and more random?The cool side is 85 and then they have their wool hen on the warm side, the hand warmer is just there as a supplemental source if they want it, but they are by no means huddled together in the wool hen constantly chirping. I suppose the chick could have been chilled, but I just don’t see the others acting cold so![]()